I just read a great book on how to postpone your return of fertility after childbirth for 14.5 months, on average (but ranging from about 9 - 30+ months!) This doesn't involve any charting, temp taking, mucus checking, etc. You can have as much 'you know what' as you want as frequently as you want, no abstinence, no withdrawal. Totally natural, very effective if done correctly.

The book is 'Breastfeeding and Natural Child Spacing' by Sheila Matgen Kippley.

Yep, great book! She also wrote Ecological Breastfeeding: the Frequency Factor, which is also super, and actually written for hcp's. Sheila is a personal friend to me and she is a fabulous author. I had 9, 14, and 22 months without periods with my kids due to these books. Well, that and support from La Leche League!